You cannot link or unlink your Apple ID/Google account for 24 hours after transferring your LINE account for security reasons. If you want to link or unlink your Apple ID/Google account after transferring your LINE account, please try doing so after 24 hours.
To link your LINE account with your Apple ID/Google account, you need to be using the latest version of LINE. If you haven't done so, update LINE to the latest version.
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